Snapshot listing speedup.

[Fabian Keil]

Pawel Jakub Dawidek <pjd at FreeBSD.org> wrote:

> If you have many snapshots and you were complaining that listing them
> takes a lot of time, you may find the commit below useful.

Indeed.
 
> It only works if your listing is limited to snapshot names and you want
> to sort also by snapshot name (by default snapshots are sorted by
> creation time).

After adjusting my backup script, I can confirm that gathering
the available snapshots is more than 200 times faster now.

Previously figuring out what to send frequently took more
time than actually sending the data.

Thanks a lot.

Fabian
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